package com.heima.controller;


import com.heima.repository.ChatHistoryRepository;
import lombok.RequiredArgsConstructor;
import org.springframework.ai.chat.client.ChatClient;
import org.springframework.ai.chat.client.advisor.AbstractChatMemoryAdvisor;
import org.springframework.ai.model.Media;
import org.springframework.util.MimeType;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.multipart.MultipartFile;
import reactor.core.publisher.Flux;

import java.util.List;
import java.util.Objects;
import java.util.stream.Stream;

import static org.springframework.ai.chat.client.advisor.AbstractChatMemoryAdvisor.CHAT_MEMORY_CONVERSATION_ID_KEY;


@RestController
@RequestMapping("/ai")
@RequiredArgsConstructor
public class ChatController {

    private final ChatClient chatClient;

    private final ChatHistoryRepository chatHistoryRepository;

//    @RequestMapping("/chat")
//    public String chat(String prompt){
//       return chatClient.prompt()
//               .user(prompt)
//               .call()
//               .content();
//    }

    @RequestMapping(value = "/chat",produces = "text/html;charset=utf-8")
    public Flux<String> chat(
            @RequestParam("prompt") String prompt,
            @RequestParam("chatId") String chatId,
            @RequestParam(value = "files",required = false) List<MultipartFile> files){
        //1.保存会话id
        chatHistoryRepository.save("chat",chatId);
        //2请求模型
        if(files == null || files.isEmpty()){
            //没有附件，纯文本聊天
            return textChat(prompt,chatId);
        }else{
            //有附件，多模态聊天
            return MultiModelChat(prompt,chatId,files);
        }

    }

    private Flux<String> MultiModelChat(String prompt, String chatId, List<MultipartFile> files) {
        //1.解析多媒体
        List<Media> medias = files.stream().
                map(file -> new Media(
                        MimeType.valueOf(Objects.requireNonNull( file.getContentType())),
                        file.getResource()
                        )
                )
                .toList();
        //2.请求模型
        return chatClient.prompt()
                .user(p -> p.text(prompt).media(medias.toArray(Media[]::new)))
                .advisors(a -> a.param(CHAT_MEMORY_CONVERSATION_ID_KEY, chatId))  //配置日志Advisor
                .stream()
                .content();
    }

    private Flux<String> textChat(String prompt, String chatId) {
        return chatClient.prompt()
                .user(prompt)
                .advisors(a -> a.param(CHAT_MEMORY_CONVERSATION_ID_KEY, chatId))  //配置日志Advisor
                .stream()
                .content();
    }
}
